My go to ability is, and always has been time manipulation. Nothing like going back in time, but the ability to slow down, speed up or stop the world around me.

Consider this. Stopping the world would have infinite uses, mostly devious. Someone with bad ass powers trying to stop you from your life of crime? Too bad, they can't you've just frozen time and messed them up before they could do anything. Same sort of deal with slowing down time. Have 5 minutes to get out of bed, get ready etc? How about you slow down time 600% and turn that into a 30 minute wakeup session?

Speeding up time would also allow you get through events that you are supposed endure. No really good examples other than perhaps traffic lights which take forever to change, or a lecture.